Abstract.
Dijet production in deep inelastic ep scattering is investigated in the region of low values of the Bjorken-variable x (10-4 < x < 10-2) and low photon virtualities Q 2 (5 < Q 2 < 100 GeV2). The measured dijet cross sections are compared with perturbative QCD calculations in next-to-leading order. For most dijet variables studied, these calculations can provide a reasonable description of the data over the full phase space region covered, including the region of very low x. However, large discrepancies at low x and low Q 2 are observed for events with small separation in azimuth between the two highest transverse momentum jets. This region of phase space is described better by predictions based on the CCFM evolution equation, which incorporates k t factorized unintegrated parton distributions. A reasonable description can be also obtained using the Color Dipole Model or models incorporating virtual photon structure.
Similar content being viewed by others
References
V.S. Fadin, E.A. Kuraev, L.N. Lipatov, Phys. Lett. B 60, 50 (1975)
V.S. Fadin, E.A. Kuraev, L.N. Lipatov, Sov. Phys. JETP 44, 443 (1976); V.S. Fadin, E.A. Kuraev, L.N. Lipatov, Sov. Phys. JETP 45, 199 (1977)
V.N. Gribov, L.N. Lipatov, Sov. J. Nucl. Phys. 15, 438 and 675 (1972); L.N. Lipatov, Sov. J. Nucl. Phys. 20, 94 (1975); G. Altarelli, G. Parisi, Nucl. Phys. B, 126, 298 (1977); Y.L. Dokshitzer, Sov. Phys. JETP 46, 641 (1977)
C. Adloff et al. [H1 Collaboration], Eur. J. Phys. C 19, 289 (2001) [hep-ex/0010054]
C. Adloff et al. [H1 Collaboration], Phys. Lett. B 515, 17 (2001) [hep-ex/0106078]
S. Chekanov et al. [ZEUS Collaboration], Eur. J. Phys. C 23, 13 (2002) [hep-ex/0109029]
J. Breitweg et al. [ZEUS Collaboration], Phys. Lett. B 507, 70 (2001) [hep-ex/0102042].
J. Breitweg et al. [ZEUS Collaboration], Eur. J. Phys. C 6, 239 (1999) [hep-ph/9805016]
C. Adloff et al. [H1 Collaboration], Nucl. Phys. B 538, 3 (1999) [hep-ph/9809028]
C. Adloff et al. [H1 Collaboration], Phys. Lett. B 462, 440 (1999) [hep-ph/9907030]
J. Breitweg et al. [ZEUS Collaboration], Phys. Lett. B 474, 223 (2000) [hep-ph/9910043]
C. Adloff et al. [H1 Collaboration], Phys. Lett. B 542, 193 (2002) [hep-ex/0206029]
Y. Balitsky, L.N. Lipatov, Sov. J. Nucl. Phys. 28, 822 (1978)
M. Ciafaloni, Nucl. Phys. B 296, 49 (1988); S. Catani, F. Fiorani, G. Marchesini, Phys. Lett. B 234, 339 (1990): S. Catani, F. Fiorani, G. Marchesini, Nucl. Phys. B 336, 18 (1990); G. Marchesini, Nucl. Phys. B 445, 49 (1995) [hep-ph/9412327]
H. Jung, L. Jönsson, H. Küster, Eur. J. Phys. C 9, 383 (1999) [hep-ph/9903306]
C. Adloff et al. [H1 Collaboration], Eur. J. Phys. C 13, 397 (2000) [hep-ex/9812024]
A. Szczurek et al., Phys. Lett. B 500, 254 (2001) [hep-ph/0011281]
A.J. Askew et al., Phys. Lett. B 338, 92 (1994) [hep-ph/9407337]
J.R. Forshaw, R.G. Roberts, Phys. Lett. B 335, 494 (1994) [hep-ph/9403363]; J. Kwieciński, A.D. Martin, A.M. Staśto, Phys. Lett. B 459, 644 (1999) [hep-ph/9904402]
C. Adloff et al. [H1 Collaboration], Eur. J. Phys. C 13, 415 (2000) [hep-ex/9806029]
I. Abt et al. [H1 Collaboration], Nucl. Inst. Meth. A 386, 310 (1997); I. Abt et al. [H1 Collaboration], Nucl. Inst. Meth. A 386, 348 (1997)
R.D. Appuhn et al. [H1 SpaCal Group], Nucl. Inst. Meth. A 386, 397 (1997)
B. Schwab, Dissertation, Universität Heidelberg (1996), +http://www.physi.uni-heidelberg.de/physi/he/+ +publications.php+
B. Andrieu et al. [H1 Calorimeter Group], Nucl. Inst. Meth. A 336, 460 (1993)
C. Adloff et al. [H1 Collaboration], Z. Phys. C 74, 221 (1997) [hep-ex/9702003]
T. Nicholls et al. [H1 SpaCal Group], Nucl. Inst. Meth. A 374, 149 (1996)
C. Adloff et al. [H1 Collaboration], Eur. J. Phys. C 21, 33 (2001) [hep-ex/0012053]
B. Andrieu et al. [H1 Calorimeter Group], Nucl. Inst. Meth. A 336, 499 (1993)
R. Pöschl, Dissertation, Universität Dortmund (2000), DissDo 2000/120
S.D. Ellis, D.E. Soper, Phys. Rev. D, 48, 3160 (1993) [hep-ph/9305266]; S. Catani et al., Nucl. Phys. B 406, 187 (1993)
S. Catani, M.H. Seymour, Nucl. Phys. B485, (1997) 291, Erratum-ibid. B 510, 503 (1997) [hep-ph/9605323]
E. Mirkes, D. Zeppenfeld, Phys. Lett. B 380, (1996) 205 [hep-ph/9511448]; E. Mirkes, TTP-97-39 (1997) [hep-ph/9711224]
D. Graudenz, DISASTER++: Version 1.0 [hep-ph/9710244]
C. Duprel et al. in: Monte Carlo Generators for HERA Physics (Hamburg, Germany, 1999), A. Doyle, G. Grindhammer, G. Ingelman, H. Jung, (eds.) pp 142, DESY-PROC-1999-02 [hep-ph/9910448]
B. Pötter, Comp. Phys. Commun. 133, 105 (2000) [hep-ph/9911221]
Z. Nagy, Z. Trocsanyi, Phys. Rev. Lett. 87, 082001 (2001) [hep-ph/0104315]
J. Pumplin et al. [CTEQ Collaboration], JHEP 0207, 012 (2002) [hep-ph/0201195]
H. Jung, G.P. Salam, Eur. J. Phys. C 19, 351 (2001) [hep-ph/0012143]; H. Jung, Comp. Phys. Commun. 143, 100 (2002) [hep-ph/0109102]
L. Lönnblad, Comp. Phys. Commun. 71, 15 (1992)
B. Andersson, G. Gustafson, L. Lönnblad, Nucl. Phys. B 339, 393 (1990)
H. Jung, Comp. Phys. Commun. 86, 147 (1995); H. Jung, The RAPGAP Monte Carlo for Deep Inelastic Scattering, version 2.08, Lund University, 1999, +http://www.desy.de/~jung/rapgap.html+
G. Ingelman, A. Edin, J. Rathsman, Comp. Phys. Commun. 101, 108 (1997) [hep-ph/9605286]
B. Andersson et al., Phys. Rept. 97, 31 (1983)
T. Sjöstrand, Comp. Phys. Commun. 39, 347; (1986) T. Sjöstrand, M. Bengtsson, Comp. Phys. Commun. 43, 367; (1987) T. Sjöstrand, Comp. Phys. Commun. 82, (1994) 74; T. Sjöstrand et al., Comp. Phys. Commun. 135, 238 (2001) [hep-ph/0010017]
A. Kwiatkowski, H. Spiesberger, H.J. Möhring, Comp. Phys. Commun. 69, 155 (1992)
K. Charchula, G.A. Schuler, H. Spiesberger, Comp. Phys. Commun. 81, (1994) 381, +http://www.desy.de/~hspiesb/djangoh.html+
M. Hansson, H. Jung, Status of CCFM - Unintegrated Gluon Densities, talk given at the XIth Int. Workshop on Deep Inelastic Scattering (DIS2003), St. Petersburg, Russia 2003, to appear in the proceedings [hep-ph/0309009]
H.L. Lai et al. [CTEQ Collaboration], Eur. J. Phys. C 12, 375 (2000) [hep-ph/9903282]
G.A. Schuler, T. Sjöstrand, Phys. Lett. B 376, 193 (1996) [hep-ph/9601282]
R. Engel, J. Ranft, Phys. Rev. D, 54, 4244 (1996) [hep-ph/9509373]
M. Klasen, G. Kramer, Phys. Lett. B 366, 385 (1996) [hep-ph/9508337]
S. Frixione, G. Ridolfi, Nucl. Phys. B 507, 315 (1997) [hep-ph/9707345]
J.C. Collins, X. Zu, JHEP 0206, 18 (2002) [hep-ph/0204127]
S. Chekanov et al. [ZEUS Collaboration], Phys. Rev. D, 67, 012007 (2003) [hep-ex/0208023].
H.L. Lai et al. [CTEQ Collaboration], Phys. Rev. D, 55, 1280 (1997) [hep-ph/9606399]
N.H. Brook et al. in: Monte Carlo Generators for HERA Physics (Hamburg, Germany, 1999), A. Doyle, G. Grindhammer, G. Ingelman, H. Jung, (eds.) pp 10, DESY-PROC-1999-02 [hep-ex/9912053]
Author information
Consortia
Additional information
Received: 10 October 2003, Published online: 3 March 2004
Rights and permissions
About this article
Cite this article
The H1 Collaboration. Inclusive dijet production at low Bjorken-x in deep inelastic scattering. Eur. Phys. J. C 33, 477–493 (2004). https://doi.org/10.1140/epjc/s2004-01644-5
Issue Date:
DOI: https://doi.org/10.1140/epjc/s2004-01644-5